4 Step #1 - When a FV protocol is added to the system every driver in the FV
5 is added to the mDiscoveredList. The SOR, Before, and After Depex are
6 pre-processed as drivers are added to the mDiscoveredList. If an Apriori
7 file exists in the FV those drivers are addeded to the
8 mScheduledQueue. The mFvHandleList is used to make sure a
9 FV is only processed once.
11 Step #2 - Dispatch. Remove driver from the mScheduledQueue and load and
12 start it. After mScheduledQueue is drained check the
13 mDiscoveredList to see if any item has a Depex that is ready to
14 be placed on the mScheduledQueue.
16 Step #3 - Adding to the mScheduledQueue requires that you process Before
17 and After dependencies. This is done recursively as the call to add
18 to the mScheduledQueue checks for Before and recursively adds
19 all Befores. It then addes the item that was passed in and then
20 processess the After dependecies by recursively calling the routine.
23 The rules for the dispatcher are in chapter 10 of the DXE CIS. Figure 10-3
24 is the state diagram for the DXE dispatcher
26 Depex - Dependency Expresion.
27 SOR - Schedule On Request - Don't schedule if this bit is set.
29 Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR>
30 This program and the accompanying materials
31 are licensed and made available under the terms and conditions of the BSD License
32 which accompanies this distribution. The full text of the license may be found at
33 http://opensource.org/licenses/bsd-license.php
35 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
36 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
43 // The Driver List contains one copy of every driver that has been discovered.
44 // Items are never removed from the driver list. List of EFI_CORE_DRIVER_ENTRY
46 LIST_ENTRY mDiscoveredList
= INITIALIZE_LIST_HEAD_VARIABLE (mDiscoveredList
);
49 // Queue of drivers that are ready to dispatch. This queue is a subset of the
50 // mDiscoveredList.list of EFI_CORE_DRIVER_ENTRY.
52 LIST_ENTRY mScheduledQueue
= INITIALIZE_LIST_HEAD_VARIABLE (mScheduledQueue
);
55 // List of handles who's Fv's have been parsed and added to the mFwDriverList.
57 LIST_ENTRY mFvHandleList
= INITIALIZE_LIST_HEAD_VARIABLE (mFvHandleList
); // list of KNOWN_HANDLE
60 // Lock for mDiscoveredList, mScheduledQueue, gDispatcherRunning.
62 EFI_LOCK mDispatcherLock
= EFI_INITIALIZE_LOCK_VARIABLE (TPL_HIGH_LEVEL
);
66 // Flag for the DXE Dispacher. TRUE if dispatcher is execuing.
68 BOOLEAN gDispatcherRunning
= FALSE
;
71 // Module globals to manage the FwVol registration notification event
73 EFI_EVENT mFwVolEvent
;
74 VOID
*mFwVolEventRegistration
;
77 // List of file types supported by dispatcher
79 EFI_FV_FILETYPE mDxeFileTypes
[] = {
80 EFI_FV_FILETYPE_DRIVER
,
81 EFI_FV_FILETYPE_COMBINED_SMM_DXE
,
82 EFI_FV_FILETYPE_COMBINED_PEIM_DRIVER
,
83 EFI_FV_FILETYPE_DXE_CORE
,
84 EFI_FV_FILETYPE_FIRMWARE_VOLUME_IMAGE
88 MEDIA_FW_VOL_FILEPATH_DEVICE_PATH File
;
89 EFI_DEVICE_PATH_PROTOCOL End
;
90 } FV_FILEPATH_DEVICE_PATH
;
92 FV_FILEPATH_DEVICE_PATH mFvDevicePath
;
95 // Function Prototypes
98 Insert InsertedDriverEntry onto the mScheduledQueue. To do this you
99 must add any driver with a before dependency on InsertedDriverEntry first.
100 You do this by recursively calling this routine. After all the Befores are
101 processed you can add InsertedDriverEntry to the mScheduledQueue.
102 Then you can add any driver with an After dependency on InsertedDriverEntry
103 by recursively calling this routine.
105 @param InsertedDriverEntry The driver to insert on the ScheduledLink Queue
109 CoreInsertOnScheduledQueueWhileProcessingBeforeAndAfter (
110 IN EFI_CORE_DRIVER_ENTRY
*InsertedDriverEntry
114 Event notification that is fired every time a FV dispatch protocol is added.
115 More than one protocol may have been added when this event is fired, so you
116 must loop on CoreLocateHandle () to see how many protocols were added and
117 do the following to each FV:
118 If the Fv has already been processed, skip it. If the Fv has not been
119 processed then mark it as being processed, as we are about to process it.
120 Read the Fv and add any driver in the Fv to the mDiscoveredList.The
121 mDiscoveredList is never free'ed and contains variables that define
122 the other states the DXE driver transitions to..
123 While you are at it read the A Priori file into memory.
124 Place drivers in the A Priori list onto the mScheduledQueue.
126 @param Event The Event that is being processed, not used.
127 @param Context Event Context, not used.
132 CoreFwVolEventProtocolNotify (
138 Convert FvHandle and DriverName into an EFI device path
140 @param Fv Fv protocol, needed to read Depex info out of
142 @param FvHandle Handle for Fv, needed in the
143 EFI_CORE_DRIVER_ENTRY so that the PE image can be
144 read out of the FV at a later time.
145 @param DriverName Name of driver to add to mDiscoveredList.
147 @return Pointer to device path constructed from FvHandle and DriverName
150 EFI_DEVICE_PATH_PROTOCOL
*
152 IN EFI_FIRMWARE_VOLUME2_PROTOCOL
*Fv
,
153 IN EFI_HANDLE FvHandle
,
154 IN EFI_GUID
*DriverName
158 Add an entry to the mDiscoveredList. Allocate memory to store the DriverEntry,
159 and initilize any state variables. Read the Depex from the FV and store it
160 in DriverEntry. Pre-process the Depex to set the SOR, Before and After state.
161 The Discovered list is never free'ed and contains booleans that represent the
162 other possible DXE driver states.
164 @param Fv Fv protocol, needed to read Depex info out of
166 @param FvHandle Handle for Fv, needed in the
167 EFI_CORE_DRIVER_ENTRY so that the PE image can be
168 read out of the FV at a later time.
169 @param DriverName Name of driver to add to mDiscoveredList.
170 @param Type Fv File Type of file to add to mDiscoveredList.
172 @retval EFI_SUCCESS If driver was added to the mDiscoveredList.
173 @retval EFI_ALREADY_STARTED The driver has already been started. Only one
174 DriverName may be active in the system at any one
179 CoreAddToDriverList (
180 IN EFI_FIRMWARE_VOLUME2_PROTOCOL
*Fv
,
181 IN EFI_HANDLE FvHandle
,
182 IN EFI_GUID
*DriverName
,
183 IN EFI_FV_FILETYPE Type
187 Get the driver from the FV through driver name, and produce a FVB protocol on FvHandle.
189 @param Fv The FIRMWARE_VOLUME protocol installed on the FV.
190 @param FvHandle The handle which FVB protocol installed on.
191 @param DriverName The driver guid specified.
193 @retval EFI_OUT_OF_RESOURCES No enough memory or other resource.
194 @retval EFI_VOLUME_CORRUPTED Corrupted volume.
195 @retval EFI_SUCCESS Function successfully returned.
199 CoreProcessFvImageFile (
200 IN EFI_FIRMWARE_VOLUME2_PROTOCOL
*Fv
,
201 IN EFI_HANDLE FvHandle
,
202 IN EFI_GUID
*DriverName
207 Enter critical section by gaining lock on mDispatcherLock.
211 CoreAcquireDispatcherLock (
215 CoreAcquireLock (&mDispatcherLock
);
220 Exit critical section by releasing lock on mDispatcherLock.
224 CoreReleaseDispatcherLock (
228 CoreReleaseLock (&mDispatcherLock
);
233 Read Depex and pre-process the Depex for Before and After. If Section Extraction
234 protocol returns an error via ReadSection defer the reading of the Depex.
236 @param DriverEntry Driver to work on.
238 @retval EFI_SUCCESS Depex read and preprossesed
239 @retval EFI_PROTOCOL_ERROR The section extraction protocol returned an error
240 and Depex reading needs to be retried.
241 @retval Error DEPEX not found.
245 CoreGetDepexSectionAndPreProccess (
246 IN EFI_CORE_DRIVER_ENTRY
*DriverEntry
250 EFI_SECTION_TYPE SectionType
;
251 UINT32 AuthenticationStatus
;
252 EFI_FIRMWARE_VOLUME2_PROTOCOL
*Fv
;
255 Fv
= DriverEntry
->Fv
;
258 // Grab Depex info, it will never be free'ed.
260 SectionType
= EFI_SECTION_DXE_DEPEX
;
261 Status
= Fv
->ReadSection (
263 &DriverEntry
->FileName
,
267 (UINTN
*)&DriverEntry
->DepexSize
,
268 &AuthenticationStatus
270 if (EFI_ERROR (Status
)) {
271 if (Status
== EFI_PROTOCOL_ERROR
) {
273 // The section extraction protocol failed so set protocol error flag
275 DriverEntry
->DepexProtocolError
= TRUE
;
278 // If no Depex assume UEFI 2.0 driver model
280 DriverEntry
->Depex
= NULL
;
281 DriverEntry
->Dependent
= TRUE
;
282 DriverEntry
->DepexProtocolError
= FALSE
;
286 // Set Before, After, and Unrequested state information based on Depex
287 // Driver will be put in Dependent or Unrequested state
289 CorePreProcessDepex (DriverEntry
);
290 DriverEntry
->DepexProtocolError
= FALSE
;
298 Check every driver and locate a matching one. If the driver is found, the Unrequested
299 state flag is cleared.
301 @param FirmwareVolumeHandle The handle of the Firmware Volume that contains
302 the firmware file specified by DriverName.
303 @param DriverName The Driver name to put in the Dependent state.
305 @retval EFI_SUCCESS The DriverName was found and it's SOR bit was
307 @retval EFI_NOT_FOUND The DriverName does not exist or it's SOR bit was
314 IN EFI_HANDLE FirmwareVolumeHandle
,
315 IN EFI_GUID
*DriverName
319 EFI_CORE_DRIVER_ENTRY
*DriverEntry
;
322 // Check every driver
324 for (Link
= mDiscoveredList
.ForwardLink
; Link
!= &mDiscoveredList
; Link
= Link
->ForwardLink
) {
325 DriverEntry
= CR(Link
, EFI_CORE_DRIVER_ENTRY
, Link
, EFI_CORE_DRIVER_ENTRY_SIGNATURE
);
326 if (DriverEntry
->FvHandle
== FirmwareVolumeHandle
&&
327 DriverEntry
->Unrequested
&&
328 CompareGuid (DriverName
, &DriverEntry
->FileName
)) {
330 // Move the driver from the Unrequested to the Dependent state
332 CoreAcquireDispatcherLock ();
333 DriverEntry
->Unrequested
= FALSE
;
334 DriverEntry
->Dependent
= TRUE
;
335 CoreReleaseDispatcherLock ();
337 DEBUG ((DEBUG_DISPATCH
, "Schedule FFS(%g) - EFI_SUCCESS\n", DriverName
));
343 DEBUG ((DEBUG_DISPATCH
, "Schedule FFS(%g) - EFI_NOT_FOUND\n", DriverName
));
345 return EFI_NOT_FOUND
;
351 Convert a driver from the Untrused back to the Scheduled state.
353 @param FirmwareVolumeHandle The handle of the Firmware Volume that contains
354 the firmware file specified by DriverName.
355 @param DriverName The Driver name to put in the Scheduled state
357 @retval EFI_SUCCESS The file was found in the untrusted state, and it
358 was promoted to the trusted state.
359 @retval EFI_NOT_FOUND The file was not found in the untrusted state.
365 IN EFI_HANDLE FirmwareVolumeHandle
,
366 IN EFI_GUID
*DriverName
370 EFI_CORE_DRIVER_ENTRY
*DriverEntry
;
373 // Check every driver
375 for (Link
= mDiscoveredList
.ForwardLink
; Link
!= &mDiscoveredList
; Link
= Link
->ForwardLink
) {
376 DriverEntry
= CR(Link
, EFI_CORE_DRIVER_ENTRY
, Link
, EFI_CORE_DRIVER_ENTRY_SIGNATURE
);
377 if (DriverEntry
->FvHandle
== FirmwareVolumeHandle
&&
378 DriverEntry
->Untrusted
&&
379 CompareGuid (DriverName
, &DriverEntry
->FileName
)) {
381 // Transition driver from Untrusted to Scheduled state.
383 CoreAcquireDispatcherLock ();
384 DriverEntry
->Untrusted
= FALSE
;
385 DriverEntry
->Scheduled
= TRUE
;
386 InsertTailList (&mScheduledQueue
, &DriverEntry
->ScheduledLink
);
387 CoreReleaseDispatcherLock ();
392 return EFI_NOT_FOUND
;
396 This is the main Dispatcher for DXE and it exits when there are no more
397 drivers to run. Drain the mScheduledQueue and load and start a PE
398 image for each driver. Search the mDiscoveredList to see if any driver can
399 be placed on the mScheduledQueue. If no drivers are placed on the
400 mScheduledQueue exit the function. On exit it is assumed the Bds()
401 will be called, and when the Bds() exits the Dispatcher will be called
404 @retval EFI_ALREADY_STARTED The DXE Dispatcher is already running
405 @retval EFI_NOT_FOUND No DXE Drivers were dispatched
406 @retval EFI_SUCCESS One or more DXE Drivers were dispatched
416 EFI_STATUS ReturnStatus
;
418 EFI_CORE_DRIVER_ENTRY
*DriverEntry
;
420 EFI_EVENT DxeDispatchEvent
;
423 if (gDispatcherRunning
) {
425 // If the dispatcher is running don't let it be restarted.
427 return EFI_ALREADY_STARTED
;
430 gDispatcherRunning
= TRUE
;
432 Status
= CoreCreateEventEx (
435 EfiEventEmptyFunction
,
437 &gEfiEventDxeDispatchGuid
,
440 if (EFI_ERROR (Status
)) {
444 ReturnStatus
= EFI_NOT_FOUND
;
447 // Drain the Scheduled Queue
449 while (!IsListEmpty (&mScheduledQueue
)) {
451 mScheduledQueue
.ForwardLink
,
452 EFI_CORE_DRIVER_ENTRY
,
454 EFI_CORE_DRIVER_ENTRY_SIGNATURE
458 // Load the DXE Driver image into memory. If the Driver was transitioned from
459 // Untrused to Scheduled it would have already been loaded so we may need to
460 // skip the LoadImage
462 if (DriverEntry
->ImageHandle
== NULL
&& !DriverEntry
->IsFvImage
) {
463 DEBUG ((DEBUG_INFO
, "Loading driver %g\n", &DriverEntry
->FileName
));
464 Status
= CoreLoadImage (
467 DriverEntry
->FvFileDevicePath
,
470 &DriverEntry
->ImageHandle
474 // Update the driver state to reflect that it's been loaded
476 if (EFI_ERROR (Status
)) {
477 CoreAcquireDispatcherLock ();
479 if (Status
== EFI_SECURITY_VIOLATION
) {
481 // Take driver from Scheduled to Untrused state
483 DriverEntry
->Untrusted
= TRUE
;
486 // The DXE Driver could not be loaded, and do not attempt to load or start it again.
487 // Take driver from Scheduled to Initialized.
489 // This case include the Never Trusted state if EFI_ACCESS_DENIED is returned
491 DriverEntry
->Initialized
= TRUE
;
494 DriverEntry
->Scheduled
= FALSE
;
495 RemoveEntryList (&DriverEntry
->ScheduledLink
);
497 CoreReleaseDispatcherLock ();
500 // If it's an error don't try the StartImage
506 CoreAcquireDispatcherLock ();
508 DriverEntry
->Scheduled
= FALSE
;
509 DriverEntry
->Initialized
= TRUE
;
510 RemoveEntryList (&DriverEntry
->ScheduledLink
);
512 CoreReleaseDispatcherLock ();
515 if (DriverEntry
->IsFvImage
) {
517 // Produce a firmware volume block protocol for FvImage so it gets dispatched from.
519 Status
= CoreProcessFvImageFile (DriverEntry
->Fv
, DriverEntry
->FvHandle
, &DriverEntry
->FileName
);
521 REPORT_STATUS_CODE_WITH_EXTENDED_DATA (
523 (EFI_SOFTWARE_DXE_CORE
| EFI_SW_PC_INIT_BEGIN
),
524 &DriverEntry
->ImageHandle
,
525 sizeof (DriverEntry
->ImageHandle
)
527 ASSERT (DriverEntry
->ImageHandle
!= NULL
);
529 Status
= CoreStartImage (DriverEntry
->ImageHandle
, NULL
, NULL
);
531 REPORT_STATUS_CODE_WITH_EXTENDED_DATA (
533 (EFI_SOFTWARE_DXE_CORE
| EFI_SW_PC_INIT_END
),
534 &DriverEntry
->ImageHandle
,
535 sizeof (DriverEntry
->ImageHandle
)
539 ReturnStatus
= EFI_SUCCESS
;
543 // Now DXE Dispatcher finished one round of dispatch, signal an event group
544 // so that SMM Dispatcher get chance to dispatch SMM Drivers which depend
547 if (!EFI_ERROR (ReturnStatus
)) {
548 CoreSignalEvent (DxeDispatchEvent
);
552 // Search DriverList for items to place on Scheduled Queue
555 for (Link
= mDiscoveredList
.ForwardLink
; Link
!= &mDiscoveredList
; Link
= Link
->ForwardLink
) {
556 DriverEntry
= CR (Link
, EFI_CORE_DRIVER_ENTRY
, Link
, EFI_CORE_DRIVER_ENTRY_SIGNATURE
);
558 if (DriverEntry
->DepexProtocolError
){
560 // If Section Extraction Protocol did not let the Depex be read before retry the read
562 Status
= CoreGetDepexSectionAndPreProccess (DriverEntry
);
565 if (DriverEntry
->Dependent
) {
566 if (CoreIsSchedulable (DriverEntry
)) {
567 CoreInsertOnScheduledQueueWhileProcessingBeforeAndAfter (DriverEntry
);
571 if (DriverEntry
->Unrequested
) {
572 DEBUG ((DEBUG_DISPATCH
, "Evaluate DXE DEPEX for FFS(%g)\n", &DriverEntry
->FileName
));
573 DEBUG ((DEBUG_DISPATCH
, " SOR = Not Requested\n"));
574 DEBUG ((DEBUG_DISPATCH
, " RESULT = FALSE\n"));
578 } while (ReadyToRun
);
581 // Close DXE dispatch Event
583 CoreCloseEvent (DxeDispatchEvent
);
585 gDispatcherRunning
= FALSE
;
592 Insert InsertedDriverEntry onto the mScheduledQueue. To do this you
593 must add any driver with a before dependency on InsertedDriverEntry first.
594 You do this by recursively calling this routine. After all the Befores are
595 processed you can add InsertedDriverEntry to the mScheduledQueue.
596 Then you can add any driver with an After dependency on InsertedDriverEntry
597 by recursively calling this routine.
599 @param InsertedDriverEntry The driver to insert on the ScheduledLink Queue
603 CoreInsertOnScheduledQueueWhileProcessingBeforeAndAfter (
604 IN EFI_CORE_DRIVER_ENTRY
*InsertedDriverEntry
608 EFI_CORE_DRIVER_ENTRY
*DriverEntry
;
611 // Process Before Dependency
613 for (Link
= mDiscoveredList
.ForwardLink
; Link
!= &mDiscoveredList
; Link
= Link
->ForwardLink
) {
614 DriverEntry
= CR(Link
, EFI_CORE_DRIVER_ENTRY
, Link
, EFI_CORE_DRIVER_ENTRY_SIGNATURE
);
615 if (DriverEntry
->Before
&& DriverEntry
->Dependent
&& DriverEntry
!= InsertedDriverEntry
) {
616 DEBUG ((DEBUG_DISPATCH
, "Evaluate DXE DEPEX for FFS(%g)\n", &DriverEntry
->FileName
));
617 DEBUG ((DEBUG_DISPATCH
, " BEFORE FFS(%g) = ", &DriverEntry
->BeforeAfterGuid
));
618 if (CompareGuid (&InsertedDriverEntry
->FileName
, &DriverEntry
->BeforeAfterGuid
)) {
620 // Recursively process BEFORE
622 DEBUG ((DEBUG_DISPATCH
, "TRUE\n END\n RESULT = TRUE\n"));
623 CoreInsertOnScheduledQueueWhileProcessingBeforeAndAfter (DriverEntry
);
625 DEBUG ((DEBUG_DISPATCH
, "FALSE\n END\n RESULT = FALSE\n"));
631 // Convert driver from Dependent to Scheduled state
633 CoreAcquireDispatcherLock ();
635 InsertedDriverEntry
->Dependent
= FALSE
;
636 InsertedDriverEntry
->Scheduled
= TRUE
;
637 InsertTailList (&mScheduledQueue
, &InsertedDriverEntry
->ScheduledLink
);
639 CoreReleaseDispatcherLock ();
642 // Process After Dependency
644 for (Link
= mDiscoveredList
.ForwardLink
; Link
!= &mDiscoveredList
; Link
= Link
->ForwardLink
) {
645 DriverEntry
= CR(Link
, EFI_CORE_DRIVER_ENTRY
, Link
, EFI_CORE_DRIVER_ENTRY_SIGNATURE
);
646 if (DriverEntry
->After
&& DriverEntry
->Dependent
&& DriverEntry
!= InsertedDriverEntry
) {
647 DEBUG ((DEBUG_DISPATCH
, "Evaluate DXE DEPEX for FFS(%g)\n", &DriverEntry
->FileName
));
648 DEBUG ((DEBUG_DISPATCH
, " AFTER FFS(%g) = ", &DriverEntry
->BeforeAfterGuid
));
649 if (CompareGuid (&InsertedDriverEntry
->FileName
, &DriverEntry
->BeforeAfterGuid
)) {
651 // Recursively process AFTER
653 DEBUG ((DEBUG_DISPATCH
, "TRUE\n END\n RESULT = TRUE\n"));
654 CoreInsertOnScheduledQueueWhileProcessingBeforeAndAfter (DriverEntry
);
656 DEBUG ((DEBUG_DISPATCH
, "FALSE\n END\n RESULT = FALSE\n"));
664 Return TRUE if the Fv has been processed, FALSE if not.
666 @param FvHandle The handle of a FV that's being tested
668 @retval TRUE Fv protocol on FvHandle has been processed
669 @retval FALSE Fv protocol on FvHandle has not yet been processed
674 IN EFI_HANDLE FvHandle
678 KNOWN_HANDLE
*KnownHandle
;
680 for (Link
= mFvHandleList
.ForwardLink
; Link
!= &mFvHandleList
; Link
= Link
->ForwardLink
) {
681 KnownHandle
= CR(Link
, KNOWN_HANDLE
, Link
, KNOWN_HANDLE_SIGNATURE
);
682 if (KnownHandle
->Handle
== FvHandle
) {
691 Remember that Fv protocol on FvHandle has had it's drivers placed on the
692 mDiscoveredList. This fucntion adds entries on the mFvHandleList if new
693 entry is different from one in mFvHandleList by checking FvImage Guid.
694 Items are never removed/freed from the mFvHandleList.
696 @param FvHandle The handle of a FV that has been processed
698 @return A point to new added FvHandle entry. If FvHandle with the same FvImage guid
699 has been added, NULL will return.
703 FvIsBeingProcesssed (
704 IN EFI_HANDLE FvHandle
709 BOOLEAN FvNameGuidIsFound
;
710 UINT32 ExtHeaderOffset
;
711 EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL
*Fvb
;
712 EFI_FIRMWARE_VOLUME_HEADER
*FwVolHeader
;
713 EFI_FV_BLOCK_MAP_ENTRY
*BlockMap
;
718 KNOWN_HANDLE
*KnownHandle
;
723 // Get the FirmwareVolumeBlock protocol on that handle
725 FvNameGuidIsFound
= FALSE
;
726 Status
= CoreHandleProtocol (FvHandle
, &gEfiFirmwareVolumeBlockProtocolGuid
, (VOID
**)&Fvb
);
727 if (!EFI_ERROR (Status
)) {
729 // Get the full FV header based on FVB protocol.
731 ASSERT (Fvb
!= NULL
);
732 Status
= GetFwVolHeader (Fvb
, &FwVolHeader
);
733 if (!EFI_ERROR (Status
)) {
734 ASSERT (FwVolHeader
!= NULL
);
735 if (VerifyFvHeaderChecksum (FwVolHeader
) && FwVolHeader
->ExtHeaderOffset
!= 0) {
736 ExtHeaderOffset
= (UINT32
) FwVolHeader
->ExtHeaderOffset
;
737 BlockMap
= FwVolHeader
->BlockMap
;
741 // Find LbaIndex and LbaOffset for FV extension header based on BlockMap.
743 while ((BlockMap
->NumBlocks
!= 0) || (BlockMap
->Length
!= 0)) {
744 for (Index
= 0; Index
< BlockMap
->NumBlocks
&& ExtHeaderOffset
>= BlockMap
->Length
; Index
++) {
745 ExtHeaderOffset
-= BlockMap
->Length
;
749 // Check whether FvExtHeader is crossing the multi block range.
751 if (Index
< BlockMap
->NumBlocks
) {
752 LbaOffset
= ExtHeaderOffset
;
758 // Read FvNameGuid from FV extension header.
760 Status
= ReadFvbData (Fvb
, &LbaIndex
, &LbaOffset
, sizeof (FvNameGuid
), (UINT8
*) &FvNameGuid
);
761 if (!EFI_ERROR (Status
)) {
762 FvNameGuidIsFound
= TRUE
;
765 CoreFreePool (FwVolHeader
);
769 if (FvNameGuidIsFound
) {
771 // Check whether the FV image with the found FvNameGuid has been processed.
773 for (Link
= mFvHandleList
.ForwardLink
; Link
!= &mFvHandleList
; Link
= Link
->ForwardLink
) {
774 KnownHandle
= CR(Link
, KNOWN_HANDLE
, Link
, KNOWN_HANDLE_SIGNATURE
);
775 if (CompareGuid (&FvNameGuid
, &KnownHandle
->FvNameGuid
)) {
776 DEBUG ((EFI_D_ERROR
, "FvImage on FvHandle %p and %p has the same FvNameGuid %g.\n", FvHandle
, KnownHandle
->Handle
, &FvNameGuid
));
782 KnownHandle
= AllocateZeroPool (sizeof (KNOWN_HANDLE
));
783 ASSERT (KnownHandle
!= NULL
);
785 KnownHandle
->Signature
= KNOWN_HANDLE_SIGNATURE
;
786 KnownHandle
->Handle
= FvHandle
;
787 if (FvNameGuidIsFound
) {
788 CopyGuid (&KnownHandle
->FvNameGuid
, &FvNameGuid
);
790 InsertTailList (&mFvHandleList
, &KnownHandle
->Link
);
798 Convert FvHandle and DriverName into an EFI device path
800 @param Fv Fv protocol, needed to read Depex info out of
802 @param FvHandle Handle for Fv, needed in the
803 EFI_CORE_DRIVER_ENTRY so that the PE image can be
804 read out of the FV at a later time.
805 @param DriverName Name of driver to add to mDiscoveredList.
807 @return Pointer to device path constructed from FvHandle and DriverName
810 EFI_DEVICE_PATH_PROTOCOL
*
812 IN EFI_FIRMWARE_VOLUME2_PROTOCOL
*Fv
,
813 IN EFI_HANDLE FvHandle
,
814 IN EFI_GUID
*DriverName
818 EFI_DEVICE_PATH_PROTOCOL
*FvDevicePath
;
819 EFI_DEVICE_PATH_PROTOCOL
*FileNameDevicePath
;
822 // Remember the device path of the FV
824 Status
= CoreHandleProtocol (FvHandle
, &gEfiDevicePathProtocolGuid
, (VOID
**)&FvDevicePath
);
825 if (EFI_ERROR (Status
)) {
826 FileNameDevicePath
= NULL
;
829 // Build a device path to the file in the FV to pass into gBS->LoadImage
831 EfiInitializeFwVolDevicepathNode (&mFvDevicePath
.File
, DriverName
);
832 SetDevicePathEndNode (&mFvDevicePath
.End
);
834 FileNameDevicePath
= AppendDevicePath (
836 (EFI_DEVICE_PATH_PROTOCOL
*)&mFvDevicePath
840 return FileNameDevicePath
;
846 Add an entry to the mDiscoveredList. Allocate memory to store the DriverEntry,
847 and initilize any state variables. Read the Depex from the FV and store it
848 in DriverEntry. Pre-process the Depex to set the SOR, Before and After state.
849 The Discovered list is never free'ed and contains booleans that represent the
850 other possible DXE driver states.
852 @param Fv Fv protocol, needed to read Depex info out of
854 @param FvHandle Handle for Fv, needed in the
855 EFI_CORE_DRIVER_ENTRY so that the PE image can be
856 read out of the FV at a later time.
857 @param DriverName Name of driver to add to mDiscoveredList.
858 @param Type Fv File Type of file to add to mDiscoveredList.
860 @retval EFI_SUCCESS If driver was added to the mDiscoveredList.
861 @retval EFI_ALREADY_STARTED The driver has already been started. Only one
862 DriverName may be active in the system at any one
867 CoreAddToDriverList (
868 IN EFI_FIRMWARE_VOLUME2_PROTOCOL
*Fv
,
869 IN EFI_HANDLE FvHandle
,
870 IN EFI_GUID
*DriverName
,
871 IN EFI_FV_FILETYPE Type
874 EFI_CORE_DRIVER_ENTRY
*DriverEntry
;
878 // Create the Driver Entry for the list. ZeroPool initializes lots of variables to
881 DriverEntry
= AllocateZeroPool (sizeof (EFI_CORE_DRIVER_ENTRY
));
882 ASSERT (DriverEntry
!= NULL
);
883 if (Type
== EFI_FV_FILETYPE_FIRMWARE_VOLUME_IMAGE
) {
884 DriverEntry
->IsFvImage
= TRUE
;
887 DriverEntry
->Signature
= EFI_CORE_DRIVER_ENTRY_SIGNATURE
;
888 CopyGuid (&DriverEntry
->FileName
, DriverName
);
889 DriverEntry
->FvHandle
= FvHandle
;
890 DriverEntry
->Fv
= Fv
;
891 DriverEntry
->FvFileDevicePath
= CoreFvToDevicePath (Fv
, FvHandle
, DriverName
);
893 CoreGetDepexSectionAndPreProccess (DriverEntry
);
895 CoreAcquireDispatcherLock ();
897 InsertTailList (&mDiscoveredList
, &DriverEntry
->Link
);
899 CoreReleaseDispatcherLock ();
906 Check if a FV Image type file (EFI_FV_FILETYPE_FIRMWARE_VOLUME_IMAGE) is
907 described by a EFI_HOB_FIRMWARE_VOLUME2 Hob.
909 @param FvNameGuid The FV image guid specified.
910 @param DriverName The driver guid specified.
912 @retval TRUE This file is found in a EFI_HOB_FIRMWARE_VOLUME2
914 @retval FALSE Not found.
919 IN CONST EFI_GUID
*FvNameGuid
,
920 IN CONST EFI_GUID
*DriverName
923 EFI_PEI_HOB_POINTERS HobFv2
;
925 HobFv2
.Raw
= GetHobList ();
927 while ((HobFv2
.Raw
= GetNextHob (EFI_HOB_TYPE_FV2
, HobFv2
.Raw
)) != NULL
) {
929 // Compare parent FvNameGuid and FileGuid both.
931 if (CompareGuid (DriverName
, &HobFv2
.FirmwareVolume2
->FileName
) &&
932 CompareGuid (FvNameGuid
, &HobFv2
.FirmwareVolume2
->FvName
)) {
935 HobFv2
.Raw
= GET_NEXT_HOB (HobFv2
);
944 Get the driver from the FV through driver name, and produce a FVB protocol on FvHandle.
946 @param Fv The FIRMWARE_VOLUME protocol installed on the FV.
947 @param FvHandle The handle which FVB protocol installed on.
948 @param DriverName The driver guid specified.
950 @retval EFI_OUT_OF_RESOURCES No enough memory or other resource.
951 @retval EFI_VOLUME_CORRUPTED Corrupted volume.
952 @retval EFI_SUCCESS Function successfully returned.
956 CoreProcessFvImageFile (
957 IN EFI_FIRMWARE_VOLUME2_PROTOCOL
*Fv
,
958 IN EFI_HANDLE FvHandle
,
959 IN EFI_GUID
*DriverName
963 EFI_SECTION_TYPE SectionType
;
964 UINT32 AuthenticationStatus
;
968 EFI_FIRMWARE_VOLUME_HEADER
*FvHeader
;
970 EFI_DEVICE_PATH_PROTOCOL
*FvFileDevicePath
;
973 // Read the first (and only the first) firmware volume section
975 SectionType
= EFI_SECTION_FIRMWARE_VOLUME_IMAGE
;
980 AlignedBuffer
= NULL
;
981 Status
= Fv
->ReadSection (
988 &AuthenticationStatus
990 if (!EFI_ERROR (Status
)) {
992 // Evaluate the authentication status of the Firmware Volume through
993 // Security Architectural Protocol
995 if (gSecurity
!= NULL
) {
996 FvFileDevicePath
= CoreFvToDevicePath (Fv
, FvHandle
, DriverName
);
997 Status
= gSecurity
->FileAuthenticationState (
999 AuthenticationStatus
,
1002 if (FvFileDevicePath
!= NULL
) {
1003 FreePool (FvFileDevicePath
);
1006 if (Status
!= EFI_SUCCESS
) {
1008 // Security check failed. The firmware volume should not be used for any purpose.
1010 if (Buffer
!= NULL
) {
1018 // FvImage should be at its required alignment.
1020 FvHeader
= (EFI_FIRMWARE_VOLUME_HEADER
*) Buffer
;
1022 // If EFI_FVB2_WEAK_ALIGNMENT is set in the volume header then the first byte of the volume
1023 // can be aligned on any power-of-two boundary. A weakly aligned volume can not be moved from
1024 // its initial linked location and maintain its alignment.
1026 if ((ReadUnaligned32 (&FvHeader
->Attributes
) & EFI_FVB2_WEAK_ALIGNMENT
) != EFI_FVB2_WEAK_ALIGNMENT
) {
1028 // Get FvHeader alignment
1030 FvAlignment
= 1 << ((ReadUnaligned32 (&FvHeader
->Attributes
) & EFI_FVB2_ALIGNMENT
) >> 16);
1032 // FvAlignment must be greater than or equal to 8 bytes of the minimum FFS alignment value.
1034 if (FvAlignment
< 8) {
1039 // Check FvImage alignment.
1041 if ((UINTN
) FvHeader
% FvAlignment
!= 0) {
1043 // Allocate the aligned buffer for the FvImage.
1045 AlignedBuffer
= AllocateAlignedPages (EFI_SIZE_TO_PAGES (BufferSize
), (UINTN
) FvAlignment
);
1046 if (AlignedBuffer
== NULL
) {
1048 return EFI_OUT_OF_RESOURCES
;
1051 // Move FvImage into the aligned buffer and release the original buffer.
1053 CopyMem (AlignedBuffer
, Buffer
, BufferSize
);
1054 FvHeader
= (EFI_FIRMWARE_VOLUME_HEADER
*) AlignedBuffer
;
1055 CoreFreePool (Buffer
);
1061 // Produce a FVB protocol for the file
1063 Status
= ProduceFVBProtocolOnBuffer (
1064 (EFI_PHYSICAL_ADDRESS
) (UINTN
) FvHeader
,
1067 AuthenticationStatus
,
1072 if (EFI_ERROR (Status
)) {
1074 // ReadSection or Produce FVB failed, Free data buffer
1076 if (Buffer
!= NULL
) {
1080 if (AlignedBuffer
!= NULL
) {
1081 FreeAlignedPages (AlignedBuffer
, EFI_SIZE_TO_PAGES (BufferSize
));
1090 Event notification that is fired every time a FV dispatch protocol is added.
1091 More than one protocol may have been added when this event is fired, so you
1092 must loop on CoreLocateHandle () to see how many protocols were added and
1093 do the following to each FV:
1094 If the Fv has already been processed, skip it. If the Fv has not been
1095 processed then mark it as being processed, as we are about to process it.
1096 Read the Fv and add any driver in the Fv to the mDiscoveredList.The
1097 mDiscoveredList is never free'ed and contains variables that define
1098 the other states the DXE driver transitions to..
1099 While you are at it read the A Priori file into memory.
1100 Place drivers in the A Priori list onto the mScheduledQueue.
1102 @param Event The Event that is being processed, not used.
1103 @param Context Event Context, not used.
1108 CoreFwVolEventProtocolNotify (
1114 EFI_STATUS GetNextFileStatus
;
1115 EFI_FIRMWARE_VOLUME2_PROTOCOL
*Fv
;
1116 EFI_DEVICE_PATH_PROTOCOL
*FvDevicePath
;
1117 EFI_HANDLE FvHandle
;
1121 EFI_FV_FILETYPE Type
;
1122 EFI_FV_FILE_ATTRIBUTES Attributes
;
1124 EFI_CORE_DRIVER_ENTRY
*DriverEntry
;
1125 EFI_GUID
*AprioriFile
;
1126 UINTN AprioriEntryCount
;
1129 UINT32 AuthenticationStatus
;
1132 KNOWN_HANDLE
*KnownHandle
;
1137 BufferSize
= sizeof (EFI_HANDLE
);
1138 Status
= CoreLocateHandle (
1141 mFwVolEventRegistration
,
1145 if (EFI_ERROR (Status
)) {
1147 // If no more notification events exit
1152 if (FvHasBeenProcessed (FvHandle
)) {
1154 // This Fv has already been processed so lets skip it!
1160 // Since we are about to process this Fv mark it as processed.
1162 KnownHandle
= FvIsBeingProcesssed (FvHandle
);
1163 if (KnownHandle
== NULL
) {
1165 // The FV with the same FV name guid has already been processed.
1171 Status
= CoreHandleProtocol (FvHandle
, &gEfiFirmwareVolume2ProtocolGuid
, (VOID
**)&Fv
);
1172 if (EFI_ERROR (Status
) || Fv
== NULL
) {
1174 // FvHandle must have Firmware Volume2 protocol thus we should never get here.
1180 Status
= CoreHandleProtocol (FvHandle
, &gEfiDevicePathProtocolGuid
, (VOID
**)&FvDevicePath
);
1181 if (EFI_ERROR (Status
)) {
1183 // The Firmware volume doesn't have device path, can't be dispatched.
1189 // Discover Drivers in FV and add them to the Discovered Driver List.
1190 // Process EFI_FV_FILETYPE_DRIVER type and then EFI_FV_FILETYPE_COMBINED_PEIM_DRIVER
1191 // EFI_FV_FILETYPE_DXE_CORE is processed to produce a Loaded Image protocol for the core
1192 // EFI_FV_FILETYPE_FIRMWARE_VOLUME_IMAGE is processed to create a Fvb
1194 for (Index
= 0; Index
< sizeof (mDxeFileTypes
) / sizeof (EFI_FV_FILETYPE
); Index
++) {
1196 // Initialize the search key
1200 Type
= mDxeFileTypes
[Index
];
1201 GetNextFileStatus
= Fv
->GetNextFile (
1209 if (!EFI_ERROR (GetNextFileStatus
)) {
1210 if (Type
== EFI_FV_FILETYPE_DXE_CORE
) {
1212 // If this is the DXE core fill in it's DevicePath & DeviceHandle
1214 if (gDxeCoreLoadedImage
->FilePath
== NULL
) {
1215 if (CompareGuid (&NameGuid
, gDxeCoreFileName
)) {
1217 // Maybe One specail Fv cantains only one DXE_CORE module, so its device path must
1218 // be initialized completely.
1220 EfiInitializeFwVolDevicepathNode (&mFvDevicePath
.File
, &NameGuid
);
1221 SetDevicePathEndNode (&mFvDevicePath
.End
);
1223 gDxeCoreLoadedImage
->FilePath
= DuplicateDevicePath (
1224 (EFI_DEVICE_PATH_PROTOCOL
*)&mFvDevicePath
1226 gDxeCoreLoadedImage
->DeviceHandle
= FvHandle
;
1229 } else if (Type
== EFI_FV_FILETYPE_FIRMWARE_VOLUME_IMAGE
) {
1231 // Check if this EFI_FV_FILETYPE_FIRMWARE_VOLUME_IMAGE file has already
1234 if (FvFoundInHobFv2 (&KnownHandle
->FvNameGuid
, &NameGuid
)) {
1239 // Check if this EFI_FV_FILETYPE_FIRMWARE_VOLUME_IMAGE file has SMM depex section.
1243 Status
= Fv
->ReadSection (
1246 EFI_SECTION_SMM_DEPEX
,
1250 &AuthenticationStatus
1252 if (!EFI_ERROR (Status
)) {
1254 // If SMM depex section is found, this FV image is invalid to be supported.
1255 // ASSERT FALSE to report this FV image.
1257 FreePool (DepexBuffer
);
1262 // Check if this EFI_FV_FILETYPE_FIRMWARE_VOLUME_IMAGE file has DXE depex section.
1266 Status
= Fv
->ReadSection (
1269 EFI_SECTION_DXE_DEPEX
,
1273 &AuthenticationStatus
1275 if (EFI_ERROR (Status
)) {
1277 // If no depex section, produce a firmware volume block protocol for it so it gets dispatched from.
1279 CoreProcessFvImageFile (Fv
, FvHandle
, &NameGuid
);
1282 // If depex section is found, this FV image will be dispatched until its depex is evaluated to TRUE.
1284 FreePool (DepexBuffer
);
1285 CoreAddToDriverList (Fv
, FvHandle
, &NameGuid
, Type
);
1289 // Transition driver from Undiscovered to Discovered state
1291 CoreAddToDriverList (Fv
, FvHandle
, &NameGuid
, Type
);
1294 } while (!EFI_ERROR (GetNextFileStatus
));
1298 // Read the array of GUIDs from the Apriori file if it is present in the firmware volume
1301 Status
= Fv
->ReadSection (
1306 (VOID
**)&AprioriFile
,
1308 &AuthenticationStatus
1310 if (!EFI_ERROR (Status
)) {
1311 AprioriEntryCount
= SizeOfBuffer
/ sizeof (EFI_GUID
);
1313 AprioriEntryCount
= 0;
1317 // Put drivers on Apriori List on the Scheduled queue. The Discovered List includes
1318 // drivers not in the current FV and these must be skipped since the a priori list
1319 // is only valid for the FV that it resided in.
1322 for (Index
= 0; Index
< AprioriEntryCount
; Index
++) {
1323 for (Link
= mDiscoveredList
.ForwardLink
; Link
!= &mDiscoveredList
; Link
= Link
->ForwardLink
) {
1324 DriverEntry
= CR(Link
, EFI_CORE_DRIVER_ENTRY
, Link
, EFI_CORE_DRIVER_ENTRY_SIGNATURE
);
1325 if (CompareGuid (&DriverEntry
->FileName
, &AprioriFile
[Index
]) &&
1326 (FvHandle
== DriverEntry
->FvHandle
)) {
1327 CoreAcquireDispatcherLock ();
1328 DriverEntry
->Dependent
= FALSE
;
1329 DriverEntry
->Scheduled
= TRUE
;
1330 InsertTailList (&mScheduledQueue
, &DriverEntry
->ScheduledLink
);
1331 CoreReleaseDispatcherLock ();
1332 DEBUG ((DEBUG_DISPATCH
, "Evaluate DXE DEPEX for FFS(%g)\n", &DriverEntry
->FileName
));
1333 DEBUG ((DEBUG_DISPATCH
, " RESULT = TRUE (Apriori)\n"));
1340 // Free data allocated by Fv->ReadSection ()
1342 CoreFreePool (AprioriFile
);
1349 Initialize the dispatcher. Initialize the notification function that runs when
1350 an FV2 protocol is added to the system.
1354 CoreInitializeDispatcher (
1358 mFwVolEvent
= EfiCreateProtocolNotifyEvent (
1359 &gEfiFirmwareVolume2ProtocolGuid
,
1361 CoreFwVolEventProtocolNotify
,
1363 &mFwVolEventRegistration
1368 // Function only used in debug builds
1372 Traverse the discovered list for any drivers that were discovered but not loaded
1373 because the dependency experessions evaluated to false.
1377 CoreDisplayDiscoveredNotDispatched (
1382 EFI_CORE_DRIVER_ENTRY
*DriverEntry
;
1384 for (Link
= mDiscoveredList
.ForwardLink
;Link
!=&mDiscoveredList
; Link
= Link
->ForwardLink
) {
1385 DriverEntry
= CR(Link
, EFI_CORE_DRIVER_ENTRY
, Link
, EFI_CORE_DRIVER_ENTRY_SIGNATURE
);
1386 if (DriverEntry
->Dependent
) {
1387 DEBUG ((DEBUG_LOAD
, "Driver %g was discovered but not loaded!!\n", &DriverEntry
->FileName
));